Overview

The OBS500 is a submersible turbidity probe with active antifouling capabilities for better measurements in biologically active water with both high and low turbidity. It outputs an SDI-12, digitally processed signal that many of our data loggers can measure. ClearSensor® and OBS® are registered trademarks of Campbell Scientific.

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Detailed Description

Design features of the OBS500 include the combination of a backscatter sensor (better at measuring higher turbidity) with a second sidescatter sensor (better at measuring lower turbidity). It has a shutter that is opened only during measurements, which reduces the time that algae or other organisms can cling to its optics.

To prevent biofouling and ensure better measurements, the OBS500 incorporates the ClearSensorMethod (U.S. Patent No. 8,429,952). This method uses a shutter/wiper mechanism to protect and clean the optics. With the ClearSensormethod, a chamber is also filled with a biocide that continuously leaches out over the optics while the probe shutter is in the closed position.

Campbell Scientific offers a disposable, plastic sleeve that can make cleanup a snap, as well as a copper sleeve that can provide additional protection, especially in sea water.

(OBS® is a registered trademark of Campbell Scientific.)

Specifications

Dual Probe

90° sidescatter and backscatter

Range

0 to 4000 NTU

Active and Passive Antifouling

Shutter, wiper, biocide, copper, optional removable sleeve

Concentration Accuracy

±2% of reading or 0.5 NTU (whichever is greater)

Operating Temperature Range

0° to 40°C

Temperature Accuracy

±0.3°C

Emitter Wavelength

850 nm

Power Requirements

9.6 to 18 Vdc

Measurement Time

< 10 s

Maximum Submersion Depth

100 m (330 ft)

Diameter

4.8 cm (1.88 in.)

Maximum Cable Length

> 500 m (1640 ft)

Length

27 cm (10.63 in.)

Weight

0.59 kg (1.3 lb)

Power Consumption

Quiescent

< 200 µA

Measurement

< 40 mA

Communication

< 40 mA

Maximum Peak Current

200 mA for 50 ms when shutter motor starts

Active Shutter Motor

< 120 mA

Outputs

SDI-12

Version 1.3, 1200 bps

RS-232

9600 bps

Analog

0 to 5 Vdc

Compatibility

Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.